Closed Bug 1170946 Opened 9 years ago Closed 9 years ago

Pressing Measure in quick succession drastically increases the occupied memory.

Categories

(Toolkit :: about:memory, defect)

Product:
Toolkit
Component:
about:memory
Version:
41 Branch
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED WONTFIX
Tracking Flags:
Tracking Status
firefox41 --- affected

People

(Reporter: VarCat, Unassigned)

Details

Environment:

FF 41
Build Id: 20150602055237
OS: Win 7 x64, Mac Os X 10.9.5

STR:

1. Start Firefox and go to about:memory
2. In quick succession press Measure.

Issue:
After each time Measure is pressed the occupied  memory is increased by 10-30 MB.

Note:
This is reproducible also on FF 38, 39 and 40.
To some extent, that is expected, because generating the page itself takes up some memory. When you click the button again, it throws out the old page, and then it takes a few seconds for the garbage collector to run and free the old page. njn did some work to reduce the amount of memory about:memory uses, but that was a while ago. Getting two successive about:memory reports would be a little more information, if somebody wanted to look into reducing the memory again.
McCreight is correct, and this is expected behaviour. There are *many* DOM nodes in about:memory and when you re-measure it throws out all the old ones and has to create a lot of new ones. After a while GC kicks in and the memory usage drops again.

Clicking "measure" repeatedly isn't a terribly useful thing to do, so IMO this isn't a problem that needs fixing.
Status: NEW → RESOLVED
Closed: 9 years ago
Resolution: --- → WONTFIX
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